The effects of L carnitine on renal function and gene expression of caspase 9 and Bcl 2 in monosodium glutamateinduced rats BMC Nephrology Springer Nature Link Early research into L carnitine was often cited as underwhelming, showing negligible changes in muscle carnitine content and fat loss outcomes. However, these findings may have been limited by a short study window Amazon.com: Renal Replacement Therapy Complete Multi Vitamin 60 Capsules, 30 Day Supply, B Complex, Antioxidant Vitamin C& E, L Carnitine & Zinc Immune, Skin, Red Cell, & Muscle Health Support Kidney Supplement : If you are like a lot of people, you may have never heard of carnitine but this important nutrient is critical for our body's ability to optimally burn fat required for energy. The adverse effects of long term l carnitine supplementation on liver and kidney function in rats L Liu, D M Zhang, M X Wang, C Y Fan, F Zhou, S J Wang, L D Kong, 2015